Bounces from Elastic Mail

@Dmitriy K - Mailwizz tries to set a webhook in EE for you automatically in order to process these events.
You should have something like this in your EE dashboard:
Screenshot 2017-08-07 13.42.34.png
In case you don't have it, edit your delivery server and click the Info icon from the edit screen in order to get the Notification URL, then go to your EE dashboard and enter it and check the right events.